question_answer

The emission spectrum of hydrogen is found to satisfy the expression for the energy change. \[\Delta E\] (in joules) such that \[\Delta E=2.18\times 10\left( \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} \right)\,\,J\] where \[{{n}_{1}}\] = 1, 2, 3?.. and \[{{n}_{2}}\] = 2, 3, 4??. The spectral lines correspond to Paschen series to                                         [UPSEAT 2002]

A)                 \[{{n}_{1}}=1\] and \[{{n}_{2}}=2,\,\,3,\,\,4\]

B)                 \[{{n}_{1}}=3\] and \[{{n}_{2}}=4,\,\,5,\,\,6\]

C)                 \[{{n}_{1}}=1\] and \[{{n}_{2}}=3,\,\,4,\,\,5\]

D)                 \[{{n}_{1}}=2\] and \[{{n}_{2}}=3,\,\,3,\,\,5\]

E)                 \[{{n}_{1}}=1\] and \[{{n}_{2}}=\text{infinity}\]